Assembly type combined sedimentation tank and integrated biochemical tank

Abstract

The application belongs to the technical field of sewage treatment, and discloses an assembled combined sedimentation tank, which comprises a tank body, the tank body is internally provided with a water inlet area, a hopper area, a horizontal flow sedimentation area and an inclined plate sedimentation area which are sequentially communicated from a water inlet end to a water outlet end, the water inlet area is communicated with the water inlet end, the inclined plate sedimentation area is communicated with the water outlet end, the inclined plate sedimentation area is internally provided with a plurality of assembled inclined plate modules, the plurality of assembled inclined plate modules are arranged side by side along the width direction of the inclined plate sedimentation area, and each assembled inclined plate module is fixedly provided with a water outlet groove, one end of the water outlet groove is connected in the assembled inclined plate module, and the other end of the water outlet groove extends out of the tank body. The inclined plate sedimentation area of the present application is designed in an assembled and modularized mode, the inclined plate sedimentation area is formed by combining a plurality of assembled inclined plate modules, and the installation convenience is improved. Meanwhile, the application further discloses an integrated biochemical tank which is designed in an assembled mode, can be built-in in the biochemical tank and can greatly save the occupied area.

Description

Technical Field

[0001] This application belongs to the field of wastewater treatment technology, specifically a prefabricated combined sedimentation tank and an integrated biological treatment tank. Background Technology

[0002] In wastewater treatment processes, the secondary sedimentation tank plays a crucial preliminary role in separating solids from clear water in the mixed liquor. Its sedimentation effect directly determines the stability and cost of subsequent biological treatment, disinfection, and effluent quality. The secondary sedimentation tank achieves the separation of particles and suspended solids through gravity separation. Its design must consider effective volume, flow uniformity, overflow weir height, and the coordinated operation of the sludge scraping system to ensure that settling time and effluent turbidity remain within a controllable range.

[0003] Horizontal flow sedimentation tanks are water treatment structures that rely on the principle of gravity sedimentation to achieve solid-liquid separation. They are characterized by simple structure and stable operation, but they have the following technical limitations: low sedimentation efficiency, large footprint, sludge treatment problems, insufficient scum removal, and operation and management defects.

[0004] Inclined plate sedimentation tanks improve settling efficiency, increase surface loading, and reduce floor space by adding inclined plates to the sedimentation tank and reducing the settling distance of particles. However, they also have disadvantages such as being prone to clogging and having poor resistance to shock loads.

[0005] To address the aforementioned issues, Chinese patent CN212594165U discloses a combined high-load sedimentation tank, comprising: an inlet zone, a horizontal flow sedimentation zone, a counter-current inclined plate sedimentation zone, and an outlet zone arranged sequentially along the water flow direction. The inlet zone is connected to an inlet pipe, and the outlet zone is connected to an outlet pipe. The inlet zone and the horizontal flow sedimentation zone are connected via a water distribution wall. Sludge scraping components are installed at the bottom of both the horizontal flow sedimentation zone and the counter-current inclined plate sedimentation zone. A sludge hopper is located at the bottom of the horizontal flow sedimentation zone, and a sludge pipe is connected inside the sludge hopper. A flow guide baffle is installed between the horizontal flow sedimentation zone and the counter-current inclined plate sedimentation zone, guiding the sludge and water from the bottom into the counter-current inclined plate sedimentation zone. The counter-current inclined plate sedimentation zone is equipped with two or more parallel inclined plates that form an angle with the horizontal direction. This invention couples the horizontal flow sedimentation zone and the counter-current inclined plate sedimentation zone, increasing the surface load of the sedimentation tank. Compared with a horizontal flow sedimentation tank, it can increase the treatment capacity of the sedimentation tank by 2 to 4 times and reduce the floor space by more than 50%.

[0006] However, the above technical solution did not adopt a prefabricated and modular design. The inclined plate area used conventional inclined plates for on-site installation instead of standardized modules, resulting in lower construction speed and lower installation quality assurance. Furthermore, the above technical solution did not consider the design of being integrated into the biological treatment tank, but rather treated it as a separate sedimentation unit. Utility Model Content

[0007] The purpose of this application is to solve the above-mentioned problems and provide a prefabricated combined sedimentation tank. The inclined plate sedimentation zone of this sedimentation tank adopts a prefabricated and modular design, forming the inclined plate sedimentation area by combining multiple prefabricated inclined plate sedimentation modules, thus improving installation convenience. Simultaneously, this application also discloses an integrated biological treatment tank, which adopts a prefabricated structural design and can be built into a biological treatment tank, significantly saving floor space.

[0008] To achieve the above objectives, this application provides the following technical solution:

[0009] A prefabricated combined sedimentation tank includes a tank body with an inlet end and an outlet end along the length of the tank body. The tank body has an inlet zone, a sludge hopper zone, a horizontal flow sedimentation zone, and an inclined plate sedimentation zone connected sequentially from the inlet end to the outlet end. The inlet zone is connected to the inlet end, and the inclined plate sedimentation zone is connected to the outlet end. A sludge pipe is provided in the sludge hopper zone. The tank body also has a sludge scraping mechanism. The inclined plate sedimentation zone has multiple prefabricated inclined plate modules arranged side by side along the width of the inclined plate sedimentation zone. One end of each prefabricated inclined plate module is connected to the inner wall of the tank body. Each prefabricated inclined plate module has a fixed outlet trough, one end of which is connected to the prefabricated inclined plate module, and the other end extends to the outside of the tank body.

[0010] Preferably, the inclined plate sedimentation zone also has multiple fixed beams, with both ends of the fixed beams connected to both sides of the length direction of the pool body. The multiple fixed beams are arranged at intervals along the length direction of the pool body. The prefabricated inclined plate module includes a fixed frame, fixed rods, and inclined plates. The fixed frame is connected to the fixed beams, and the top and bottom of the fixed frame are open. One end of the fixed frame along its length direction is connected to one end of the pool body along its length direction by bolts. The length of the fixed rod extends along the length direction of the fixed frame, and both ends of the fixed rod are connected to the inner end face of the fixed frame. The bottom end of the inclined plate is connected to the fixed rod, and the two side walls of the inclined plate are connected to the inner side wall of the fixed frame. Multiple inclined plates are arranged at intervals along the length direction of the fixed rods. One end of the outlet trough along its length direction is connected to the inner end face of the fixed frame and is located above the inclined plate. The other end of the outlet trough along its length direction extends to the outside of the pool body.

[0011] Preferably, the prefabricated inclined plate module also includes a water outlet weir plate, the length of which extends along the length of the water outlet channel. The top of the water outlet weir plate has teeth, and the water outlet weir plate has multiple strip holes. The multiple strip holes are arranged at intervals along the length of the water outlet weir plate. The water outlet weir plate is connected to both sides of the water outlet channel by bolts, and the installation height of the water outlet weir plate can be adjusted up and down by bolts within the strip holes.

[0012] Preferably, the assembled inclined plate module further includes a purging module, which is a perforated air pipe. There are multiple perforated air pipes, the length of which extends along the length direction of the inclined plate module and is spaced apart along the width direction of the inclined plate module. The perforated air pipes are located below the multiple assembled inclined plate mechanisms and above the movement trajectory of the sludge scraping mechanism in the inclined plate sedimentation area. The output end of the perforated air pipe faces upward, and the input end of the perforated air pipe is connected to an external air supply device.

[0013] Preferably, the fixed frame has multiple water distribution holes on one or both sides along its length. The multiple water distribution holes are located at the bottom of the fixed frame and are arranged at intervals along the length of the fixed frame. The multiple water distribution holes are used to allow mud and water to enter the assembled inclined plate module from the water distribution holes at the bottom of the fixed frame. Mud and water separation is completed in the middle of the inclined plate. Clean water is discharged from the water outlet trough above the inclined plate. The separated sludge slides down the inclined plate to the bottom of the pool and is scraped to the sludge hopper area by the sludge scraping mechanism.

[0014] Preferably, it also includes a slag skimming mechanism connected to the end of the horizontal sedimentation zone, and a sludge scraping mechanism connected to the tank body, the sludge scraping mechanism having a first direction of action and a second direction of action;

[0015] The first direction of movement is at the surface of the horizontal sedimentation zone, moving from the beginning to the end of the horizontal sedimentation zone in the direction of the water flow; the second direction of movement is at the bottom of the inclined plate sedimentation zone, moving to the mud hopper zone in the direction of the water flow.

[0016] Preferably, there is a water distribution wall between the water inlet zone and the sludge hopper zone, and the water distribution wall has multiple openable and closable through holes located in the upper middle part of the water distribution wall; the bottom of the sludge hopper zone has a funnel section, and the sludge pipe is connected to the converging end of the funnel section, or, is arranged vertically in the sludge hopper zone, and the input end of the sludge pipe is located at the converging end of the funnel section.

[0017] Preferably, the sludge scraping mechanism is a chain plate scraper, which performs closed-loop reciprocating motion on the liquid surface of the horizontal sedimentation zone, the bottom of the inclined plate sedimentation zone, and the bottom of the horizontal sedimentation zone.

[0018] Preferably, the scum skimming mechanism is a scum hopper or a scum skimming pipe module, and a scum collection trough is provided on one side of the pool body;

[0019] When the scum-skimming mechanism is a scum hopper, the two ends of the scum hopper are connected to both sides of the length of the pool and are located in the horizontal sedimentation zone. The inlet end of the scum hopper faces upward, and the bottom of the scum hopper is connected to a scum discharge pipe. One end of the scum discharge pipe is connected to the scum hopper, and the other end passes through the side wall of the pool and is connected to the scum collection trough.

[0020] When the skimming mechanism is a skimming pipe module, the skimming pipe module includes a skimming pipe assembly and a drive assembly. The two ends of the skimming pipe assembly are fixedly connected to both sides of the length direction of the pool body. The skimming pipe assembly has a rotatable skimming pipe. The drive assembly is connected to the top of the pool body and is connected to the skimming pipe for transmission. The drive assembly is used to drive the skimming pipe to rotate back and forth. One side wall of the pool body along its length direction has a slag discharge hole that connects the skimming pipe to the slag collection tank.

[0021] Meanwhile, this application also provides an integrated biological treatment tank, which has the above-mentioned assembled combined sedimentation tank. The assembled combined sedimentation tank can be built into the biological treatment tank to connect the biological treatment tank with the influent area, or it can be located outside the biological treatment tank and connected to the influent area through a pipeline. The sludge pipe is connected to an external return device and is used to return the sludge to the biological treatment tank.

[0022] Compared with the prior art, the beneficial effects of this application are:

[0023] 1. This application couples the horizontal flow sedimentation zone and the inclined plate sedimentation zone, dividing the sedimentation tank into two stages: "coarse sedimentation" and "fine sedimentation". The horizontal flow sedimentation zone can give full play to the regional sedimentation advantages, separate high-concentration sludge, quickly form a sludge-water interface, and most of the sludge is settled and discharged in time, which greatly reduces the sludge concentration entering the inclined plate sedimentation zone. The inclined plate sedimentation zone operates with a lower sludge load, further improving the sedimentation effect and reducing the problem of easy sludge accumulation and blockage. It also increases the surface load of the sedimentation tank, improves the treatment capacity of the sedimentation tank, and reduces the footprint.

[0024] 2. The inclined plate sedimentation area of ​​this application adopts a prefabricated and modular design. The inclined plate sedimentation area is formed by combining multiple prefabricated inclined plate sedimentation modules, which improves the ease of installation compared with the traditional inclined plate installation method.

[0025] 3. The sludge scraping mechanism of this application adopts a first action direction and a second action direction. In the first action direction, it can cooperate with the scum skimming mechanism to clean the surface scum, and in the second action direction, it can clean the bottom sediment sludge, thus achieving two cleaning functions.

[0026] The four applications also include a purging mechanism below the inclined plate mechanism, which automatically purifies the inclined plate at intervals to further reduce the risk of blockage and reduce labor intensity;

[0027] 5. This application can be modularly and assembled for use in conjunction with a biochemical pool, or it can be placed directly inside the biochemical pool, reducing the floor space by more than 50%. Attached Figure Description

[0028] Figure 1 This is one of the structural schematic diagrams of the assembled combined sedimentation tank of Embodiment 1 of this application;

[0029] Figure 2 yes Figure 1 Top view;

[0030] Figure 3 This is a schematic diagram of the water distribution wall in Embodiment 1 of this application;

[0031] Figure 4 This is a schematic diagram of the slag skimming tube of Embodiment 1 of this application;

[0032] Figure 5 This is a schematic diagram of the outlet weir plate of Embodiment 1 of this application;

[0033] Figure 6 This is a structural schematic diagram of the assembled inclined plate module of Embodiment 1 of this application;

[0034] Figure 7 This is a schematic diagram of the inclined plate sedimentation zone fully covered in Embodiment 1 of this application;

[0035] Figure 8 This is a schematic diagram of the inclined plate sedimentation zone spacing in Embodiment 1 of this application;

[0036] Figure 9 This is a schematic diagram of the integrated biochemical tank of Embodiment 2 of this application;

[0037] The labels for each item are as follows:

[0038] 1. Tank body; 11. Inlet area; 12. Sludge hopper area; 13. Horizontal sedimentation area; 14. Inclined plate sedimentation area; 15. Sludge scraping mechanism; 16. Skimming mechanism; 17. Water distribution wall; 18. Sludge collection trough; 121. Sludge pipe; 122. Funnel section; 141. Prefabricated inclined plate module; 151. Sludge discharge hole; 161. Skimming pipe assembly; 162. Drive assembly; 171. Through hole; 172. Gate plate; 1611. Skimming pipe; 1411. Fixed beam; 1412. Fixed frame; 1413. Fixed rod; 1414. Inclined plate; 1415. Outlet trough; 1416. Outlet weir plate; 1417. Toothed part; 1418. Strip hole; 1419. Water distribution hole; A. Biological tank. Detailed Implementation

[0039] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0040] Example 1

[0041] refer to Figures 1-8A prefabricated combined sedimentation tank includes a tank body 1, with one end of the tank body 1 being an inlet end and the other end being an outlet end. The tank body 1 has an inlet zone 11, a sludge hopper zone 12, a horizontal flow sedimentation zone 13, and an inclined plate sedimentation zone 14 connected sequentially from the inlet end to the outlet end. The inlet zone 11 is connected to the inlet end, and the inclined plate sedimentation zone 14 is connected to the outlet end. The sludge hopper zone 12 is provided with a sludge pipe 121. The tank body 1 also has a sludge scraping mechanism 15. The inclined plate sedimentation zone 14 has multiple prefabricated inclined plate modules 141 arranged side by side along the width direction of the inclined plate sedimentation zone 14. One end of each prefabricated inclined plate module 141 is connected to the inner wall of the tank body 1. Each prefabricated inclined plate module 141 has a fixed outlet trough 1415, one end of which is connected to the prefabricated inclined plate module 141, and the other end extends to the outside of the tank body 1.

[0042] As a preferred embodiment, the pool body 1 can be modularized, and the installation and transportation costs of each piece of equipment can be reduced by more than 30% after modular installation of each piece of equipment. More specifically, the horizontal sedimentation zone 13, sludge hopper zone 12, and inclined plate sedimentation zone 14 can be designed as segmented sections made of steel or plastic. Different parts can be prefabricated in the factory and assembled on-site. For steel, the tank body 1 can be formed by on-site welding. Alternatively, connecting plates can be installed on the segmented horizontal sedimentation zone 13, sludge hopper zone 12, and inclined plate sedimentation zone 14, and bolted together to form the tank body 1. For plastic, connecting plates are more suitable. However, a one-piece design for the tank body 1 is also possible, depending on the treatment scale. For smaller treatment scales (Q≤2500m³ / d), a one-piece design is suitable. For larger treatment scales, the sedimentation tank can be segmented and assembled on-site. The effective depth of the horizontal sedimentation zone 13 and inclined plate sedimentation zone 14 is 2.5–3.5m, and the depth of the sludge hopper zone 12 exceeds 3.5m. Compared to traditional concrete sedimentation tanks, the segmented design allows for direct transportation to the site for installation based on treatment requirements.

[0043] After the tank body 1 is installed, the operator can install the prefabricated inclined plate modules 141 into the corresponding inclined plate sedimentation areas 14 in sequence. Multiple prefabricated inclined plate modules 141 form the inclined plate sedimentation area 14. Compared with the existing installation method, which requires welding the base frame first, then installing the inclined plates 1414 on the base frame at a preset angle and spacing, and finally welding the outlet tank 1415, the prefabricated inclined plate modules 141 of this embodiment can be pre-installed. Of course, it is also possible that the prefabricated inclined plate modules 141 are in their factory-prepared state. During on-site installation, according to the width of the inclined plate sedimentation area and the length of the tank body 1, the prefabricated inclined plate modules 141 are arranged side by side along the width direction of the inclined plate sedimentation area 14 and connected to the inner wall of the tank body 1. Bolt connection or welding can be used, which improves the convenience of installation.

[0044] Furthermore, the inclined plate sedimentation zone 14 also has multiple fixed beams 1411, with both ends of the fixed beams 1411 connected to both sides of the length direction of the tank body 1. The multiple fixed beams 1411 are arranged at intervals along the length direction of the tank body 1. The prefabricated inclined plate module 141 includes a fixed frame 1412, a fixed rod 1413, and an inclined plate 1414. The fixed frame 1412 is connected to the fixed beams 1411, and the top and bottom of the fixed frame 1412 are open. One end of the fixed frame 1412 along its length direction is connected to one end of the tank body 1 along its length direction by bolts. The fixed rod... The length of 1413 extends along the length direction of the fixed frame 1412. The two ends of the fixed rod 1413 are connected to the inner end face of the fixed frame 1412. The bottom end of the inclined plate 1414 is connected to the fixed rod 1413. The two side walls of the inclined plate 1414 are connected to the inner side wall of the fixed frame 1412. Multiple inclined plates 1414 are arranged at intervals along the length direction of the fixed rod 1413. One end of the water outlet trough 1415 along its length direction is connected to the inner end face of the fixed frame 1412 and is located above the inclined plate 1414. The other end of the water outlet trough 1415 along its length direction extends to the outside of the pool body 1.

[0045] More specifically, the multiple fixed beams 1411 mainly serve a supporting function. They can be connected to the side walls of the pool body 1 via bolts during on-site installation, or they can be welded. Regarding the connection method between the fixed frame 1412 and the fixed beams 1411, on-site welding is preferred. The fixed frame 1412 consists of two side plates and two end plates, welded together to form a cuboid structure. The two ends of the fixing rods 1413 are connected to the inner end faces of the fixed frame 1412, i.e., the two end plates. Preferably, two inclined plates 1414 are used. The inclined plates 1414 are welded to the fixed rod 1413 by welding. The spacing between the inclined plates 1414 is preferably 80-200mm, and the length is 1m-2m. They are installed at 60°. One end of the outlet trough 1415 is welded to the end plate near the horizontal sedimentation zone 13, and the other end extends to the outside of the pool body 1. The mud-water mixture in the sedimentation tank located in the inclined plate 1414 will be further refined. The water enters the outlet trough 1415 by overflow and is discharged under the guidance of the outlet trough 1415.

[0046] In practical applications, the length of the inclined plate sedimentation zone 14 accounts for approximately 1 / 4 to 1 / 2 of the total length of the tank body 1. The prefabricated inclined plate modules 141 can be installed at intervals for ease of maintenance and installation; see reference for details. Figure 8 Alternatively, a full-coverage method can be used; please refer to the following for details. Figure 7 However, it should be noted that no gaps should be left along the length of pool body 1.

[0047] The prefabricated inclined plate module 141 adopts a standard modular design with a width of 1-2m. The length of a single prefabricated inclined plate module 141 is generally 1m, 2m, or 3m, and can also be customized as needed. Other lengths can be combined according to these three lengths. For example, when the length of the inclined plate sedimentation area 14 is 5 meters, a combination of 2m and 3m modules can be used, or a combination of two 2m modules and one 1m module can be used.

[0048] In the preferred installation method, two adjacent prefabricated inclined plate modules 141 are fitted together.

[0049] It should also be noted that, in the art, inclined tubes and inclined plates 1414 with the same function should be regarded as conventional replacements for the prior art, and therefore the use of inclined tubes should also be within the scope of protection of this application.

[0050] In other embodiments, the water outlet 1415 can be replaced by a pipe, with the same connection method as the water outlet 1415. One end is connected to the fixed frame 1412, and the other end extends outside the pool body 1. The pipe diameter is Φ50~150mm, with staggered 45° upward holes of φ15~25mm on both sides. The pipe is detachable for easy cleaning and replacement.

[0051] Furthermore, the prefabricated inclined plate module 141 also includes a water outlet weir plate 1416, which extends along the length of the water outlet channel 1415. The top of the water outlet weir plate 1416 has teeth 1417, and the water outlet weir plate 1416 has multiple strip holes 1418. The multiple strip holes 1418 are arranged at intervals along the length of the water outlet weir plate 1416. The water outlet weir plate 1416 is bolted to both sides of the water outlet channel 1415, and the installation height of the water outlet weir plate 1416 can be adjusted up and down by bolts within the strip holes 1418.

[0052] In practical use, the length of the outlet weir plate 1416 is the same as the length of the outlet channel 1415. The outlet weir plate 1416 serves as a side plate of the outlet channel 1415. The height of the outlet weir plate 1416 can be adjusted vertically through multiple slotted holes 1418 to adapt to different situations and ensure precise control of the top height of the outlet weir plate 1416. After adjustment to the desired height, it can be tightened with bolts, which is convenient and quick.

[0053] In this embodiment, the assembled inclined plate module 141 also includes a purging module (not shown in the figure). The purging module is a perforated air pipe, and there are multiple perforated air pipes. The length of the multiple air pipes extends along the length direction of the inclined plate 1414 module and is arranged at intervals along the width direction of the inclined plate 1414 module. The perforated air pipes are located below the multiple assembled inclined plate 1414 mechanisms and above the movement trajectory of the sludge scraping mechanism 15 in the inclined plate sedimentation area 14. The output end of the perforated air pipe faces upward, and the input end of the perforated air pipe is connected to an external air supply device.

[0054] Specifically, the purging module can adopt a purging mechanism well known to those skilled in the art. In this embodiment, the purging module adopts a perforated air pipe, wherein one end of the perforated air pipe is connected to an external air supply device, specifically a blower connected to an air tank or directly connected to a blower. The other end of the perforated air pipe passes through the pool body 1 and is located in the inclined plate sedimentation zone 14. High-pressure fluid is used to remove the sludge accumulated in the gaps of the inclined plate 1414, so that air can enter each independent space of the inclined plate 1414 to ensure the purging effect.

[0055] Preferably, the fixed frame 1412 has a plurality of water distribution holes 1419 on one or both sides along its length direction. The plurality of water distribution holes 1419 are located at the lower part of the fixed frame 1412 and are arranged at intervals along the length direction of the fixed frame. The plurality of water distribution holes 1419 are used to allow mud and water to enter the assembled inclined plate module 141 from the water distribution holes 1419 at the bottom of the fixed frame 1412. Mud and water separation is completed in the middle of the inclined plate 1414. Clean water is discharged from the water outlet 1415 above the inclined plate 1414. The separated sludge slides down the inclined plate 1414 to the bottom of the pool body 1 and is scraped to the sludge hopper area 12 by the sludge scraping mechanism 15.

[0056] Specifically, water distribution holes 1419 are opened on one or both sides of the fixed frame 1412 to ensure that the mud-water mixture flows evenly and stably into the inclined plate sedimentation zone 14, resulting in good sedimentation effect. The mud-water mixture enters the fixed frame 1412 from the bottom and side, and passes through the inclined plate 1414 from bottom to top. The suspended solids and water are separated in the inclined plate 1414. The separated sludge can slide down the inclined plate 1414 to the bottom of the inclined plate sedimentation zone 14. By rotating the sludge scraping mechanism 15 set at the bottom of the inclined plate sedimentation zone 14, the sludge is scraped and sent to the funnel part 122 of the sludge hopper zone 12.

[0057] Preferably, it also includes a skimming mechanism 16, which is connected to the end of the horizontal sedimentation zone 13, and a sludge scraping mechanism 15 is connected inside the tank body 1. The sludge scraping mechanism 15 has a first operating direction and a second operating direction.

[0058] The first direction of movement is at the liquid surface of the horizontal sedimentation zone 13, moving from the beginning to the end of the horizontal sedimentation zone 13 in the direction of the water flow; the second direction of movement is at the bottom of the inclined plate sedimentation zone 14, moving to the mud hopper zone 12 in the direction of the water flow.

[0059] It should be noted that in this embodiment, the sludge scraping mechanism 15 adopts a chain-plate sludge scraper, which is existing technology in the field. Alternatively, a horizontal flow sludge scraper or a single-rail horizontal flow sludge scraper, both well-known to those skilled in the art, can also be used. For more details, refer to the sludge scraping device for a horizontal flow sedimentation tank in a wastewater treatment plant disclosed in Chinese Patent CN218392389U. The active roller, driven roller, sprocket, chain, and scraper plate in this embodiment are described. Specifically, the active roller needs to be driven by an external motor or motor chain wheel. A non-metallic chain-plate sludge scraper is preferred.

[0060] In this design, by arranging the chain-plate scraper, the scraper plates inside can move from the beginning to the end of the horizontal sedimentation zone 13 in the direction of the water flow; and from the bottom of the inclined plate sedimentation zone 14 to the mud hopper zone 12 in the direction of the water flow. Implicitly, the first and second action directions mentioned above refer to the working directions with actual effect. As is well known to those skilled in the art, the chain-plate scraper should have a transitional movement between the first and second action directions. That is, starting from the beginning of the horizontal sedimentation zone 13, it first moves in the direction of the water flow to the end of the horizontal sedimentation zone 13, and then moves at an angle to the bottom of the inclined plate sedimentation zone 14. Below the inclined plate sedimentation zone 14, it first moves in the direction of the water flow and then changes to moving against the water flow, and continues to move to the mud hopper zone 12. The movement to the mud hopper zone 12 refers to the edge of the mud hopper zone 12, that is, the connection position between the horizontal sedimentation zone 13 and the mud hopper zone 12. Finally, it moves upward from the mud hopper zone 12 to the beginning of the horizontal sedimentation zone 13, which is one movement cycle. The liquid surface of the horizontal sedimentation zone 13, the bottom of the inclined plate sedimentation zone 14, and the bottom of the horizontal sedimentation zone 13 reciprocate in a closed loop.

[0061] In this motion cycle, the first direction of motion works in conjunction with the skimming mechanism 16 to remove scum, while the second direction of motion removes settled sludge. (Refer to...) Figure 1 The first direction is the x-direction, the second direction is the y-direction, and the length direction of pool 1 and the direction of water flow are also in the x-direction.

[0062] It should also be noted that the tilting motion mentioned above to the area below the inclined plate sedimentation zone 14 involves the chain bending in the opposite direction, which can be achieved by adding a sprocket outside the area around the chain.

[0063] The sludge-water mixture enters the horizontal flow sedimentation zone 13 from the inlet zone 11. In the horizontal flow sedimentation zone 13, the sludge settles under its own weight, forming a coarse sedimentation stage. This stage fully utilizes the regional sedimentation advantages, separating high-concentration sludge and quickly forming a sludge-water interface. Most of the sludge is settled and discharged in a timely manner, significantly reducing the sludge concentration entering the inclined plate sedimentation zone 14. Subsequently, the sludge-water mixture enters the inclined plate sedimentation zone 14, where fine sedimentation occurs, further improving the sedimentation effect and outputting water that meets discharge regulations. Simultaneously, the sludge pipe 121 can be connected to an external return device to return the sludge in the sludge hopper zone 12 to the biological treatment tank for further utilization.

[0064] Preferably, the scraper travels at a speed of 0.5 to 1.8 m / min, which is frequency-adjustable and equipped with a digital display to show its travel speed.

[0065] Furthermore, a water distribution wall 17 is provided between the water inlet zone 11 and the sludge hopper zone 12. The water distribution wall 17 has multiple openable and closable through holes 171, which are located in the upper middle part of the water distribution wall 17. The bottom of the sludge hopper zone 12 has a funnel section 122. The sludge pipe 121 is connected to the converging end of the funnel section 122, or it is arranged vertically in the sludge hopper zone 12, and the input end of the sludge pipe 121 is located at the converging end of the funnel section 122.

[0066] Specifically, the water distribution wall 17 and the through holes 171 ensure that the mud-water mixture enters the horizontal sedimentation zone 13 in a horizontal flow state. Regarding the multiple openable and closable through holes 171 on the water distribution wall 17, the opening and closing can be controlled by a gate valve 172, or the through holes 171 can be closed by inserting a plate on the side of the water distribution wall 17 near the inlet zone 11, to facilitate control of the inlet flow and for maintenance and drainage. Regarding the gate valve 172 control, an electric gate valve, well-known to those skilled in the art, can be used; its specific structure can be found in the Baidu Encyclopedia entry.

[0067] When the incoming water flows through the open through-hole 171, it can be evenly distributed and flow steadily horizontally forward. When the through-hole 171 is closed, the incoming water can be cut off, and the sludge and sewage in the sedimentation tank can be emptied by an external sludge pump for easy maintenance.

[0068] Preferably, the scum skimming mechanism 16 is a scum hopper or a scum skimming pipe module, and the pool body 1 has a scum collection trough 18 on one side;

[0069] When the scum skimming mechanism 16 is a scum hopper, the two ends of the scum hopper are connected to both sides of the length direction of the pool body 1 and are located in the horizontal sedimentation zone 13. The inlet end of the scum hopper faces upward, and the bottom of the scum hopper is connected to a scum discharge pipe. One end of the scum discharge pipe is connected to the scum hopper, and the other end passes through the side wall of the pool body 1 and is connected to the scum collection tank 18.

[0070] When the skimming mechanism 16 is a skimming pipe module, the skimming pipe module includes a skimming pipe assembly 161 and a drive assembly 162. The two ends of the skimming pipe assembly 161 are fixedly connected to both sides of the length direction of the pool body 1. The skimming pipe assembly 161 has a rotatable skimming pipe. The drive assembly 162 is connected to the top of the pool body 1 and is connected to the skimming pipe in a transmission manner. The drive assembly 162 is used to drive the skimming pipe to rotate back and forth. One side wall of the pool body 1 along its length direction has a slag discharge hole that connects the skimming pipe to the slag collection tank 18.

[0071] More specifically, the skimming pipe module is existing technology. In this embodiment, a skimming pipe module well known to those skilled in the art can be used. In addition, regarding the skimming pipe module, reference can be made to a skimming pipe device for a secondary sedimentation tank disclosed in Chinese Patent CN219290691U. In this embodiment, the tank body 1 corresponds to the sedimentation tank of this scheme, the rotatable skimming pipe in the skimming pipe module corresponds to the skimming pipe in this scheme, the drive component 162 corresponds to the manual / electric hoist in this scheme, and the transmission connection corresponds to the connection method of the lead screw and the lifting lug in this scheme. Regarding the installation method of the skimming pipe module, the installation method of this technical solution can be adopted. Therefore, in this embodiment, it is not excluded that the skimming pipe module adopts the skimming pipe device for a secondary sedimentation tank of this technical solution.

[0072] Meanwhile, regarding the skimming pipe module, one can also refer to a skimming pipe steering device disclosed in Chinese Patent CN210874255U, in which the pool body 1 corresponds to the sedimentation tank of this scheme, the slag discharge hole corresponds to the skimming hole of this scheme, the rotatable skimming pipe corresponds to the skimming pipe in this scheme, the installation method of the skimming pipe module can adopt the installation method of this technical scheme, the drive component 162 corresponds to the rotary motor in this scheme, and the transmission connection corresponds to the worm gear and turbine connection method of this scheme. Therefore, in this embodiment, it is not excluded that the skimming pipe module adopts the skimming pipe and steering device of this technical scheme.

[0073] In other embodiments, the scum-skimming mechanism 16 is a scum hopper (not shown in the figure). The two ends of the scum hopper are connected to both sides of the length direction of the pool body 1 and are located in the horizontal sedimentation zone 13. The inlet end of the scum hopper faces upward, and the bottom of the scum hopper is connected to a scum discharge pipe. One end of the scum discharge pipe is connected to the scum hopper, and the other end passes through the side wall of the pool body 1 and is connected to the scum collection tank 18.

[0074] Specifically, the scum hopper can refer to a sludge scraping device for a horizontal flow sedimentation tank in a wastewater treatment plant disclosed in Chinese Patent CN218392389U, where the scum hopper corresponds to the scum hopper in this design, and the inlet of the scum hopper corresponds to the scum inlet. More specifically, the scum hopper can be a trough, specifically a through trough, that is, a trough open at both ends and the top. The two ends of the trough are connected to the two side walls of the tank body 1, and the two ends of the trough are closed by the two side walls of the tank body 1. One side wall has a scum discharge hole, which is connected to the trough and is used to discharge the scum in the trough into the scum collection trough 18.

[0075] Implicitly, the operation of the purging module should be intermittent, which is a standard setting for those skilled in the art. Specifically, the aeration pipe can be connected to a solenoid valve, which is electrically connected to an external PLC system. In addition, the electric gate valve and the chain-plate scraper can also be electrically connected to the PLC system, achieving linkage through the external PLC system. The aeration pipe achieves intermittent operation through the solenoid valve. The backwashing time interval can be automatically adjusted according to the sludge layer height, or it can operate automatically according to a set time interval.

[0076] The purging mechanism can also adopt the aeration pipe of the aerated inclined plate 1414 sedimentation tank disclosed in Chinese Patent CN111643933A, and the arrangement of this scheme can be used. The PLC system and electrical connection of the peripheral equipment all adopt technologies well known to those skilled in the art.

[0077] Example 2

[0078] refer to Figure 9 An integrated biological treatment tank, wherein the biological treatment tank A has a prefabricated combined sedimentation tank as in Example 1. The prefabricated combined sedimentation tank is either built into the biological treatment tank so that the biological treatment tank is connected to the inlet water area 11, or located outside the biological treatment tank A and connected to the inlet water area 11 through a pipeline. The sludge pipe 121 is connected to an external return device and is used to return sludge to the biological treatment tank A.

[0079] Specifically, the tank body 1 can be placed inside the biological tank A by welding or bolting, or it can be connected to the biological tank A through the water inlet end. The specific connection method is pipe connection. Both methods can connect the biological tank A to the water inlet area 11 and return the sludge to the biological tank A through the sludge pipe 121.

[0080] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0081] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A prefabricated combined sedimentation tank, comprising a tank body, with one end along the length of the tank body as an inlet end and the other end as an outlet end. The tank body has an inlet zone, a sludge hopper zone, a horizontal flow sedimentation zone, and an inclined plate sedimentation zone sequentially connected from the inlet end to the outlet end. The inlet zone is connected to the inlet end, the inclined plate sedimentation zone is connected to the outlet end, a sludge pipe is provided in the sludge hopper zone, and the tank body also includes a sludge scraping mechanism. The tank body is characterized in that… The inclined plate sedimentation zone has multiple prefabricated inclined plate modules, which are arranged side by side along the width of the inclined plate sedimentation zone. One end of each prefabricated inclined plate module is connected to the inner wall of the pool body. Each prefabricated inclined plate module has a fixed water outlet trough, one end of which is connected to the prefabricated inclined plate module and the other end extends to the outside of the pool body.

2. The prefabricated combined sedimentation tank according to claim 1, characterized in that, The inclined plate sedimentation zone also has multiple fixed beams, with both ends of the fixed beams connected to both sides of the length direction of the pool body. The fixed beams are spaced apart along the length direction of the pool body. The prefabricated inclined plate module includes a fixed frame, fixed rods, and inclined plates. The fixed frame is connected to the fixed beams, and the top and bottom of the fixed frame are open. One end of the fixed frame along its length direction is bolted to one end of the pool body along its length direction. The length of the fixed rod extends along the length direction of the fixed frame, and both ends of the fixed rod are connected to the inner end face of the fixed frame. The bottom end of the inclined plate is connected to the fixed rod, and the two side walls of the inclined plate are connected to the inner side wall of the fixed frame. Multiple inclined plates are spaced apart along the length direction of the fixed rods. One end of the outlet trough along its length direction is connected to the inner end face of the fixed frame and is located above the inclined plates. The other end of the outlet trough along its length direction extends to the outside of the pool body.

3. The prefabricated combined sedimentation tank according to claim 2, characterized in that, The prefabricated inclined plate module also includes a water outlet weir plate, the length of which extends along the length of the water outlet channel. The top of the water outlet weir plate has teeth, and the water outlet weir plate has multiple strip holes. The multiple strip holes are arranged at intervals along the length of the water outlet weir plate. The water outlet weir plate is connected to both sides of the water outlet channel by bolts, and the installation height of the water outlet weir plate can be adjusted up and down by bolts in the strip holes.

4. The prefabricated combined sedimentation tank according to claim 1, characterized in that, The assembled inclined plate module also includes a purging module, which is a perforated air pipe. There are multiple perforated air pipes, and the length of the multiple air pipes extends along the length direction of the inclined plate module and is arranged at intervals along the width direction of the inclined plate module. The perforated air pipes are located below the multiple assembled inclined plate mechanisms and above the movement trajectory of the sludge scraping mechanism in the inclined plate sedimentation area. The output end of the perforated air pipe faces upward, and the input end of the perforated air pipe is connected to an external air supply device.

5. The prefabricated combined sedimentation tank according to claim 2, characterized in that, The fixed frame has multiple water distribution holes on one or both sides along its length. The multiple water distribution holes are located at the lower part of the fixed frame and are arranged at intervals along the length of the fixed frame. The multiple water distribution holes are used to allow mud and water to enter the assembled inclined plate module from the water distribution holes at the bottom of the fixed frame. Mud and water separation is completed in the middle of the inclined plate. Clean water is discharged from the water outlet trough above the inclined plate. The separated sludge slides down the inclined plate to the bottom of the pool and is scraped to the sludge hopper area by the sludge scraping mechanism.

6. The prefabricated combined sedimentation tank according to claim 1, characterized in that, It also includes a slag skimming mechanism connected to the end of the horizontal sedimentation zone, and a sludge scraping mechanism connected to the tank body, the sludge scraping mechanism having a first direction of action and a second direction of action; The first direction of movement is the liquid surface in the horizontal sedimentation zone, moving from the beginning to the end of the horizontal sedimentation zone in the direction of water flow; the second direction of movement is the bottom of the inclined plate sedimentation zone, moving to the sludge hopper zone in the direction of water flow.

7. The prefabricated combined sedimentation tank according to claim 1, characterized in that, A water distribution wall is provided between the water inlet area and the sludge hopper area. The water distribution wall has multiple openable and closable through holes, which are located in the upper middle part of the water distribution wall. The bottom of the sludge hopper area has a funnel section. The sludge pipe is connected to the converging end of the funnel section, or it is arranged vertically in the sludge hopper area, and the input end of the sludge pipe is located at the converging end of the funnel section.

8. The prefabricated combined sedimentation tank according to claim 1, characterized in that, The sludge scraping mechanism is a chain plate sludge scraper, which performs closed-loop reciprocating motion at the liquid surface of the horizontal sedimentation zone, the bottom of the inclined plate sedimentation zone, and the bottom of the horizontal sedimentation zone.

9. The prefabricated combined sedimentation tank according to claim 6, characterized in that, The skimming mechanism is a scum bucket or a skimming pipe module, and the pool body has a scum collection trough on one side. When the scum-skimming mechanism is a scum hopper, the two ends of the scum hopper are connected to both sides of the length direction of the pool body and are located in the horizontal sedimentation zone. The inlet end of the scum hopper faces upward, and the bottom of the scum hopper is connected to a scum discharge pipe. One end of the scum discharge pipe is connected to the scum hopper, and the other end passes through the side wall of the pool body and is connected to the scum collection trough. When the skimming mechanism is a skimming tube module, the skimming tube module includes a skimming tube assembly and a drive assembly. The two ends of the skimming tube assembly are fixedly connected to both sides of the length direction of the pool body. The skimming tube assembly has a rotatable skimming tube. The drive assembly is connected to the top of the pool body and is driven by the skimming tube. The drive assembly is used to drive the skimming tube to rotate reciprocally. One side wall of the pool body along its length direction has a slag discharge hole that connects the skimming tube to the slag collection tank.

10. An integrated biochemical tank, characterized in that, The biological treatment tank includes a prefabricated combined sedimentation tank as described in any one of claims 1 to 9. The prefabricated combined sedimentation tank is either built into the biological treatment tank to connect the biological treatment tank with the inlet area, or located outside the biological treatment tank and connected to the inlet area via a pipeline. The sludge pipe is connected to an external return device and is used to return sludge to the biological treatment tank.

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